Electropneumatic-machine.



PATENTED JAN. 21, 1908.

I w. K. RANKIN. ELBGTROPNEUMATIG MACHINE.

APPLICATION FILED FEB.15. 190s.

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Inventor. WQZZamICRczn/(in.

.No. 877,369. PATENTED JAN. 21, 1908. W. K. RANKIN. .ELEGTROPNEUMATIGMACHINE.

APPLIGATION FILED 113.15, 1906.

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UNITED STATES PATENT onnicn.

WILLIAM K. RANKIN, OF

PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO JOHN E. REYBURN,

OF PHILADELPHIA, PENNSYLVANIA. T

ELEGTROPNEUMATIC -MACHINE.

Specification of Letters Patent.

' Application filed February 16. 1906. Serial No. 301.161-

Patented Jan. a1, 1908.

To all whom it may concern:

Be it known that I, WILLIAM K. RANKIN, 'a citizen of the United States,residing at Phila delphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inElectropneumatic Machines, of which the following is a specification. 1

This invention relates to electrically driven motor-compressors,designed more especially for electricallydriven cars and their pneumaticbrakes. A special feature is the removal of the motor and pumps fromclose proximity, so that the heat generated by the pumps, incompressing, shall not be communicated to the armature and fields.Whilethe motor is in horizontal position, and the pumps in verticalposition, they are inclosed in one integral casing, but in compartmentsso inclosed and covered that the pump plungers and the armature areentirely separated, for convenience of removal, when needing in- Thefields are alsore The compartment for the crank shaft and worm .Wheel isalso provided with a cover which can be removed without interferencewith the pumps or motor. By the creased over the horizonta arrangementof a horizontal motor, and ver' tical pumps, the durability of thepumps, their pistons and packin s are greatly inl pumps heretofore inuse, and by employing a worm and worm wheel for transmitting the powerthe jar and noise produced'by the machine are reduced to a minimum,something very desirable in passenger cars.

There are other new, useful and desirable features whichwillbe further(pointed out in the specification and illustrate in the accompanyingdrawings in which similar characters of reference indicate similar partsthroughout the views, in which Figure Lis a side elevation. 2 is a topview. Fig. 3 is a section on line X X Fig. 2. Fig. 4 is partly a sectionon line S .S.Fig. 3, andpartly an exterior view, or elevation at thepump end. Fig. 5 is an elevation view of the motor case with the doorsand central support removed. Fig. 6-is asection throiigh the pump pistonoppositely to that seen in Fig.4, or on line Z Z Fig. 2. Fig. '7 is anend view of the clutch for the armature and worm shaft. Fig. Sisa-section on line W Figs. 1, 3 ofthe'motor compartment doors. Fig. 9 isan end view of the worm shaft23.

I There is an integral casing comprising the motor compartment 1, thepum arrels 2, 3 and the worm wheel and cra shaft compartment 4, thelatter having an under cover 5 which also serves as an oil reservoirinto which the cranks for the pumps dip, and by their rapid rotationthrow oil to the pistons interiors and the ledges thereon, for lubri- 1eating the pump cylinders and pistons, as hereinafter set forth. Themotor compartment is rectangular in cross section, and its front end iscovered with a central support 6 removably secured by bolts 7, thesupport carries a bearing 8 for the armature shaft 9 above an oilchamber 10 in which runs an oiling ring 11, and a thrusi collar 12 abutsbearing 8 and commutator 4. Shaft 9 carrice the commutator 14 andarmature 15, and towards its inner end there is a clutch 16 withprojections 17 and depressions 18 which engage similar projections anddepressions in the Worm shaft, the clutch is screwed to the shaft andfurther secured by a set screw 19- eme itpf the. two shafts whichprevents undue fr1c tion, and enables the withdrawal of the armature bysimply removing support 6. At the front end of the motor compartmentthere are two doors 24, 25, hinged to outwardly, and having latches 26on studs 27 to engage lugs 28 of the support 6. When the doors areopened there is free access to 'the fields, armature, etc. and theyprevent any entrance of dust or foreign matter to the motor. Adjoiningthe armature shaftis the worm 29 with the inner shaft 23 already deifgribed, and {1111 lputer shaft 30; 23, 29, .1310

ing .integra earings 31 32 carry t e shaft, each beairing beingseciired. from turnar 35 abutting collar 36 of worm 29 and .inglby dowel33, 34, hearing 31 having a 7 co seated in case 4 and cover 37. againstend movement, while bea 32 is similarly provided for by a collar 38. Atthe outer end of cured to case 4 and-cover 37 by cap 42. Cover 37mclosesgwormg29 and bearings 31,

shaft 30 there is a ball bearing thrust balls 39'inclosed between disks40, 41 and se- 32 and is provided with oil channels 43,44 to convey theoil thrown up by worm 29 to the bearings, the inner-end of the cover hasa flange 45 abutting compartment 1, and a flange 46 forming a receptacle47 which with a similar flange 48 and receptacle 49in compartment 4prevent any oil from entering the interior of compartment 1. drives aworm wheel 50 which is secured to a central hub 51 of the crank shaft bya key 4 bearings 59 made in halves, over which fit the lower ends of theconnecting rods 60, and

their caps 61, the upper ends of the rods bemg secured to pistons 62 bypins 63. The lstons have asolid upper part and annular ower part and areprovided with packing I rmgs 64 and a central circumferential oil groove65 upon their exterior annular part,

80 and u on their; interior I with integral upturne oil catching ledges66 (see Fig. 6) partially encircling two sides of the interior of thepiston, with passages 67 therefrom to -the groove 65, 'by this means theoil which is I 85 thrown up by the cranks is caught on the ledges andflows to the exterior of the piston for the lubrication of the pumpcylinder and its lpiston. Pumps 2, 3 have heads 68, 69

eac head having at its side nearest the center a valve chamber 70inclosing an inlet valve 71 and having a cap or cover 72. Under thesevalves, and connecting the pump bodies, is an intake passage 73 having ascreen 74 secured underneath, covered by extensions 75 of the heads andleading through ports 76 into the pumps. Centrally dis osed on each headis a valve chamber 77 inc osmg an outlet valve 78 and having a cap orcover 79. From chambers 77 there 80 .are passages 80connecting. with acentral T 81 with a coupling 82 to a-pipe 83 leading to l the air tankor reservoir, (not shown.)

Within compartment, above and below the-- armature 15, are the integralpole plates 84,

85, and at the sides of the armature are the and having dowel bolts 89to secure aline ment. which is secured the brush holder yoke.

- I claim. I p

1 In an electro-pneumatic machine, an lntegral casenomprisin a motorcompart ment, vertical pump cy ders and a worm Worm 29 Central support 6has a seat 90 upon' I wheel and crank shaft compartment the pumpcylinders, a central support attached to the front of the motorcompartment, doors hinged at the front of the motor compartment andfastened to the central support, a cover secured under the worm wheeland crank compartment, removable heads for the pump1 cylinders, valvesin the heads, a motor Wit tons within the pump cylinders, a worm and aworm wheel driven by the motor, and con nections therefrom for thereciprocation of the pump pistons. 2. In an electro-pneumatic machine,an integralcase, one part of which incloses a motor, its front beinginclosed inpart by a removably secured central support, and by hingeddoors; another part of the case inclosing a worm, a worm wheel and acrank shaft, with a bottom cover removably secured; and another ,part ofthe case comprising pump barrels vertically disposed; a motor within itspart of the case, a worm, a worm wheel, and a crank shaftwithin theirpart of the case, heads for the pumps and valves therefor, pistons inthe pum s, connections from the pistpns to the cran shaft, a bearing inthe central support for one. end of the motor shaft, and a hollow shaftfor the worm into in its compartment, piswhich the motor shaft isinserted to form a bearing at its opposite end.v

' 3. In an electro-pneumatic machine, an integral case, comprising acompartment for a motor with an outer attached end cover in three parts,the side parts being hinged doors, the central part forming a bearingfor a motor shaft, an oil chamber and a seat for a brush holder and amotor with removable fields in the compartment, the shaft for the,

motor having its outer end seated in the bearing aforesaid; a worm andworm wheel oompartment, being an integral part with the motorcompartment, of the whole case, a worm therein, a shaft for the wormwhich is annular at its inner end and into which the innenend of themotor shaft is inserted, an. interlocking clutch for the motor and wormshafts; bearings for the worm-shaft, a cover for the bearings and theworm, oil passages therein leading to the bearings, and a ball f bearingthrust for the outer end of the worm shaft, and pump cylinders integralwith the -motor and worm wheel compartment, and

vertically located above the worm wheel w iLLIAMf RANKIN. Witnesses: I I

LOUIS H. REDNER,, RANsoM .C. WRIGHT.

compartment, and valves and pistons therefields 86, 87 removably securedby bolts 88, f

